sensor TOYOTA T100 1996 Factory Service Manual

Downloaded from www.Manualslib.com manuals search engine N14677
Fuse
DI−400
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
SRS Warning Light Circuit Malfunction (Does not light up, when
ignition switch is turned to ACC or ON.)
CIRCUIT DESCRIPTION
The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality
When terminal Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.
WIRING DIAGRAM
See page DI−398.
INSPECTION PROCEDURE
1 Check ECU−B Fuse.
PREPARATION:
Remove ECU−B fuse.
CHECK:
Check continuity of ECU−B fuse.
OK:
Continuity
HINT:
Fuse may be burnt out even if it appears to be OK during
visual inspection.
If fuse is OK, install it.
NG Go to step 6.
OK
2 Check connection of center airbag sensor assembly connector.
NG Repair.
OK
DI98B−01

Downloaded from www.Manualslib.com manuals search engine H18116
Airbag Sensor Assembly
LA
(−)
(+)ON
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−401
1996 TOYOTA T100 (RM449U)
3 Preparation. (See step 1 on page DI−396)
4 Check SRS warning light circuit.
PREPARATION:
(a) Connect negative (−) terminal cable to battery.
(b) Turn ignition switch to ACC or ON.
CHECK:
Measure voltage LA terminal of harness side connector of cen-
ter airbag sensor assembly and body ground.
OK:
Voltage: 10 − 16 V
NG Check SRS warning light bulb/repair SRS
warning light circuit.
OK

Downloaded from www.Manualslib.com manuals search engine AB0118AB0119W05587W05586
H00350
H00346
Center Airbag
Sensor Assembly
Spiral
CableD Squib
ACC ON
w/o Tachometer w/ Tachometeror
DI−402
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
5 Does SRS warning light come on?
PREPARATION:
(a) Disconnect negative (−) terminal cable from the battery.
(b) Connect center airbag sensor assembly connector.
(c) Connect negative (−) terminal cable to battery, and wait
at least 2 seconds.
(d) Turn ignition switch to ACC or ON.
CHECK:
Check operation of SRS warning light.
OK:
SRS warning light comes on.
NO Check terminal LA of center airbag sensor
assembly. If normal, replace center airbag
sensor assembly.
YES
From results of above inspection, malfunctioning part can now be considered normal. To make
sure of this, use simulation method to check.
6 Is new ECU−B fuse burnt out again?
NO Using simulation method, reproduce
malfunction symptoms. (See page IN−16)
YES
Check harness between ECU−B fuse and
SRS warning light.

Downloaded from www.Manualslib.com manuals search engine R15206
DLC1Tc IE111
Y−B6
EB
BR
E1
Y−BY−B 11
Short Connector8
Tc Center Airbag
Sensor Assembly
3
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−403
1996 TOYOTA T100 (RM449U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminal Tc and E1 of the DLC1, the airbag sensor assembly is set in the DTC output mode.
The DTCs are displayed by the blinking of the SRS warning light.
WIRING DIAGRAM
DI0Y1−02

Downloaded from www.Manualslib.com manuals search engine H18117
LOCK Airbag Sensor Assembly
Tc
(+) (−)
DI−406
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TOYOTA T100 (RM449U)
4 Check center airbag sensor assembly.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative (−) terminal cable from the battery,
and wait at least 90 seconds.
(c) Remove steering wheel pad (See page SR−13 or
SR−26).
(d) Disconnect center airbag sensor assembly connector.
(e) Insert service wire into terminal Tc from back side as
shown.
(f) Connect center airbag sensor assembly connector with
service wire.
(g) Connect negative (−) terminal cable to battery.
(h) Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.
(i) Connect service wire of terminal Tc to body ground.
CHECK:
Check operation of SRS warning light.
OK:
SRS waning light comes on.
NOTICE:
Never make a mistake with the terminal connection posi-
tion as this cause a malfunction.
OK Check harness between center airbag sensor
assembly and DLC1.
NG
Replace center airbag sensor assembly.

Downloaded from www.Manualslib.com manuals search engine R14303
Airbag Sensor Assembly
− DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI−407
1996 TOYOTA T100 (RM449U)
If DTC is displayed without DTC check procedure, perform following trouble-
shooting:
1 Check resistance between terminal Tc of center airbag sensor assembly and
body ground.
PREPARATION:
(a) Turn ignition switch to LOCK.
(b) Disconnect negative (−) terminal cable from the battery,
and wait at least 90 seconds.
(c) Disconnect center airbag sensor assembly connector.
CHECK:
Check resistance between terminal Tc of center airbag sensor
assembly connector and body ground.
OK:
Resistance: 1MΩ or Higher
NG Repair or replace harness or connector.
OK
Replace center airbag sensor assembly.

Downloaded from www.Manualslib.com manuals search engine N06022
DI34V−02
BE4034
Indicator Light
1.5 sec.0.5 sec.
ON
OFF
I22833
DLC1 DI−410
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
PRE−CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator.
(1) Turn the ignition switch to ON.
(2) Check that the CRUISE MAIN indicator light comes
on when the cruise control main switch is turned on,
and that the indicator light goes off when the main
switch is turned OFF.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting (See page BE−36) for the combination meter
section.
(b) Check the DTC.
HINT:
If a malfunction occurs in the No. 1 vehicle speed sensors or ac-
tuator, etc. during cruise control driving, the ECU actuates
AUTO CANCEL of the cruise control and turns on and off the
CRUISE MAIN indicator light to inform the driver of a malfunc-
tion. At the same time, the malfunction is stopped in memory as
a diagnostic trouble code.
(c) Using diagnosis check wire, check the output of DTC.
(1) Turn the ignition switch ON.
(2) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843−18020
(3) Read the DTC on the CRUISE MAIN indicator light.

Downloaded from www.Manualslib.com manuals search engine BE6443
1
12
No.Operation MethodCRUISE MAIN Indicator LIght
Blinking PatternDiagnosis
1
2
3
4Drive approx. 40 km/h
(25 mph) or over
Drive approx 40 km/h
(25 mph) or below
LightON
OFF
LightON
OFF
ON
OFFSET/COAST switch circuit
is normal
RES/ACC switch circuit
is normal
LightON
OFF LightON
OFF
1sec.
0.25 sec. 0.25 sec.Push the speed control switch
SET/COAT on.
Push the speed control switch
RESUME/ACCEL on.
Each cancel switch turned
ON.
 Speed control switch (to
CANCEL)
 Stop light switch
 Park/Neutral position switch
(to N or O Position)
 Clutch start switch
 Parking brake switch
Speed sensor circuit is
normal
Speed sensor circuit is
normalEach cancel switch is
normal
5 DI−414
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 TOYOTA T100 (RM449U)
5. INPUT SIGNAL CHECK
HINT:
For check No.1 ∼ No.3
Turn ignition switch ON.
For check No.4
Jack up the vehicle.
Start the engine.
Shift to D position.
(a) Press the control switch to SET/COAST or RES/ACC
position and hold it down or hold it up ”(1)”.
(b) Push the main switch ON ”(2)”.
(c) Check that the CRUISE MAIN indicator light blinks twice
or 3 times repeatedly after 3 seconds.
(d) Turn the SET/COAST or RES/ACC switch OFF.
(e) Operate each switch as listed in the table below.
(f) Read the blinking pattern of the CRUISE MAIN indicator
light.
(g) After performing the check, turn the main switch OFF.
HINT:
When 2 or more signals are input to the ECU, the lowest num-
bered code will be displayed first.

Downloaded from www.Manualslib.com manuals search engine DI34W−02
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−415
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below and proceed to the appropriate page.
DTC No.
(See Page)Detection ItemTrouble Area
11
(DI−420)Actuator Motor Circuit
Actuator
Wire harness
Cruise control ECU
12
(DI−422)Actuator Magnetic Clutch Circuit
Actuator
Stop light switch
Wire harness
Cruise control ECU
13
(DI−425)Actuator Position Sensor Circuit
Actuator
Wire harness
Cruise control ECU
21
(DI−428)Vehicle Speed Sensor Circuit
Vehicle speed sensor
Wire harness
Cruise control ECU
*23
(DI−428)Actuator Control Cable
Vehicle Speed Sensor circuit
Vehicle speed sensor
Speed control cable function
Wire harness
Cruise control ECU
32
(DI−431)Control Switch Circuit
Cruise control switch
Wire harness
Cruise control ECU
34
(DI−431)Voltage abnormality in control switch circuit
Control switch
Wire harness
Cruise control ECU
41 Cruise Control ECUCruise control ECU
HINT:
When 2 or more codes are indicated, the lowest numbered code will be displayed first.
*When the vehicle speed decreases on uphill roads, the speed can be set again and drive can be continued
(This is not a malfunction.).

Downloaded from www.Manualslib.com manuals search engine DI34Z−02
− DIAGNOSTICSCRUISE CONTROL SYSTEM
DI−419
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSee page
SET not occourring or CANCEL occurring.
(DTC is Normal)
1. Main Switch Circuit
(Cruise control switch)
2. Vehicle Speed Sensor
3. Control Switch Circuit
(Cruise control switch)
4. Stop Light Switch Circuit
5. Park/Neutral Position Switch Circuit
6. Actuator Motor Circuit
7. Cruise Control Cable
8. Cruise Control ECU
DI−454
DI−428
DI−431
DI−434
DI−443
DI−420
DI−458
IN−26
SET not occurring or CANCEL occurring.
(DTC is not output)1. ECU Power Source Circuit
2. Cruise Control ECUDI−449
IN−26
Actual vehicle speed deviates above or below the set speed.
1. Cruise Control Cable
2. Vehicle Speed Signal Abnormal
3. Electronically Controlled Transmission
Communication Circuit
4. Actuator Motor Circuit
5. Idle Signal Circuit
(Main throttle position sensor)
6. Cruise Control ECUDI−458
DI−428
DI−440
DI−420
DI−437
IN−26
Gear shifting frequent between 3rd and O/D when driving on uphill
road. (Hurting)1. Electronically Controlled Transmission
Communication Circuit
2. Cruise Control ECUDI−440
IN−26
Cruise control not cancelled, even when brake pedal is de-
pressed.
1. Cruise Control Cable
2. Stop Light Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI−458
DI−434
DI−420
IN−26
Cruise control not cancelled, even when transmission is shifted to
”N” postion.
1. Cruise Control Cable
2. Park/Neutral Position Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI−458
DI−443
DI−420
IN−26
Control switch does not operate.
(SET/COAST, ACC/RES, CANCEL not possible)
1. Cruise Control Cable
2. Control Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI−458
DI−431
DI−420
IN−26
SET possible at 40 km/h (25 mph) or less, or CANCEL does not
operate at 40 km/h (25 mph) or less.
1. Cruise Control Cable
2. Vehicle Speed Signal Abnormal
3. Actuator Motor Circuit
4. Cruise Control ECUDI−458
DI−428
DI−420
IN−26
Poor response in ACCEL and RESUME modes.
1. Cruise Control Cable
2. Electronically Controlled Transmission
Communication Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI−458
DI−440
DI−420
IN−26
O/D does not resume, even though the road is not uphill.
1. Electronically Controlled Transmission
Communication Circuit
2. Cruise Control ECU
DI−440
IN−26
DTC memory is erased.1. Back−up Power Source Circuit
2. Cruise Control ECUDI−452
IN−26
DTC is not output, or is output when it should not be.1. Tc Circuit
2. Cruise Control ECUDI−456
IN−26
Cruise MAIN indicator light remains ON or fails to light up.1. Cruise MAIN Indicator Light Switch Circuit−